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We report the crystal structure of E. coli ketopantoate hydroxymethyltransferase (KPHMT) at 1.9 A resolution, in complex with its product, ketopantoate. KPHMT catalyzes the first step in the biosynthesis of pantothenate (vitamin B(5)), the precursor of coenzyme A and the acyl carrier protein cofactor. The structure of the decameric enzyme was solved by multiwavelength anomalous dispersion to locate 160 selenomethionine sites and phase 560 kDa of protein, making it the largest structure solved by this approach. KPHMT adopts the (betaalpha)(8) barrel fold and is a member of the phosphoenolpyruvate/pyruvate superfamily. The active site contains a ketopantoate bidentately coordinated to Mg(2+). Similar binding is likely for the substrate, alpha-ketoisovalerate, orienting the C3 for deprotonation.

Type

Journal article

Journal

Structure

Publication Date

08/2003

Volume

11

Pages

985 - 996

Keywords

Amino Acid Sequence, Binding Sites, Crystallography, X-Ray, Dimerization, Escherichia coli, Gene Expression, Hydroxymethyl and Formyl Transferases, Magnesium, Models, Molecular, Molecular Sequence Data, Molecular Structure, Molecular Weight, Pantothenic Acid, Protein Structure, Secondary, Recombinant Proteins, Selenomethionine, Sequence Homology, Amino Acid, Spectrum Analysis, Raman, Static Electricity, Substrate Specificity